EIP-2026-103704

PRE-CVE

WebKit - TypedArray.copyWithin Memory Corruption

Title source: legacy
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for EIP-2026-103704. PoCs published by Google Security Research.

AI-analyzed exploit summary This exploit leverages a bug in JavaScriptCore's TypedArray.copyWithin function, where a neutered array and large indices allow writing to absolute memory pointers. The PoC demonstrates arbitrary memory write via crafted indices and a valueOf function that neuters the array.

Description

WebKit - TypedArray.copyWithin Memory Corruption

Exploits (1)

exploitdb WORKING POC VERIFIED
by Google Security Research · htmldosmultiple
https://www.exploit-db.com/exploits/40184

This exploit leverages a bug in JavaScriptCore's TypedArray.copyWithin function, where a neutered array and large indices allow writing to absolute memory pointers. The PoC demonstrates arbitrary memory write via crafted indices and a valueOf function that neuters the array.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: WebKit/JavaScriptCore (Safari Technology Preview)
No auth needed
Prerequisites: WebKit with TypedArray.copyWithin support (pre-production Safari)
devstral-2 · analyzed Feb 18, 2026 Full analysis →

Details

Status pre_cve
Tracked Since Feb 18, 2026